Add bin and edit workflow

bin/gems/pdf-reader-2.14.1/examples/callbacks.rb

@@ -0,0 +1,23 @@
+#!/usr/bin/env ruby
+# coding: utf-8
+
+# List all callbacks generated by each page
+#
+# WARNING: this will generate a *lot* of output, so you probably want to pipe
+#          it through less or to a text file.
+
+require 'rubygems'
+require 'pdf/reader'
+
+filename = File.expand_path(File.dirname(__FILE__)) + "/../spec/data/cairo-basic.pdf"
+
+PDF::Reader.open(filename) do |reader|
+  reader.pages.each do |page|
+    receiver = PDF::Reader::RegisterReceiver.new
+    page.walk(receiver)
+    
+    receiver.callbacks.each do |cb|
+      puts cb
+    end
+  end
+end